Effect of seed rate on vegetative growth and yield properties of two varieties of spinach and weeds

Sonia Hiwa Othman, Bakhtyar Abdulla Hamasaaid , Soran Othman Abdulla
Department of Horticulture, Faculty of Agricultural Sciences, University of Sulaimani, Kurdistan Region, Iraq.
Department of Plant Protection, Directorate of Research Center in Sulaimani.


Abstract

An experiment was conducted at the Agricultural Research Station in Bakrajo- Sulaimaniyah, from 7th October, 2013 to 24th March, 2014 to investigate the effect of different seed rates (16, 28, 40 Kg ha-1) on a number of weeds m-2 and their dry weight. Furthermore, some vegetative and yield characters of two spinach varieties (local and Syrian) were measured. The experiment designated in factorial randomized complete block design (RCBD-factorial). Comparisons between the means of the characters were carried out according to Duncan’s Multiple Range Test at the 5 % level. Results revealed that 40kg ha-1 exhibited significant differences in reducing thenumber and dry weight of weeds at both growth stages [100 and 125 days after spinach seed sowing (DAS)] by 67.86 and 75.82% for weed’s number and for weed’s dry weight (67.57 and 48.27%) as compared to 16 kg ha-1. Also 40 kg ha-1 was significantly superior in increasing accumulative yield (kg m-2), Dry weight (g m-2), leaf area (cm2 plant-1),spinach number m-2and leaf number plant-1 by60.91, 66.56, 57.33, 47.93 and 28.88% ascompared to 16 kg ha-1, respectively. The local variety got the highest values in decreasing the number and dry weight of weeds at both growth stages 100 and 125DAS by 43.94 and 51.76% for weed’s number and by 19.46 and 30.49% for weed’s dry weight, compared to the Syrian variety, respectively. The local variety showed significant differences, as compared to Syrian variety, in accumulative yield (kg m-2), dry weight (g m-2), leaf area (cm2 plant-1), spinach number m-2 and leaf number plant-1 by 49.40, 47.06, 38.64, 30.97 and 21.86%, respectively. To sum up, seeding rate of 40 kg ha-1 was best in reducing the number and dry weight of weeds, and it caused significant increases in all studied parameters.

Key Words:
Seed rate Weed, Spinach Local variety Syrian variety.

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